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POCOM object works in Win7 but not XP
 

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  1. POCOM object works in Win7 but not XP
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    <p>This is frustrating me to no end. I have a OPOS program that reads RFID cards. I wrote 2 C# COM libraries. Both work in Windows 7 with no problems. One of them was rather difficult to get working, but I finally got it. To get my COM libraries to work with the OPOS program I had to make sure that the target platform was x86. Since I have win7 pro and I this same program runs on other computers that are x86 and run Win XP I fired up my virtual machine. I've tried a million things to try to get this to work and to no avail. Things I've tried</p> <p>My one C# library (keyboard) at first required that not only I use regasm but also I had to have that library in the location as the Service object and the executable (ie my OPOS program) I found that in Win7 if i search for the GUID in registry there is a key called CodeBase that is basically the location of the library. If i put that same key into my XP machine I don't have to have the library in both locations. Tested it and it works great.</p> <p>So then the need for another library came about. It is written in C# (same as keyboard) with almost the exact same settings. The ONLY difference between the two is the Network library class that inherits the interface has <code>ComSourceInterfaces(typeof(ITapEvents)</code> AND uses Log4Net. I've never used Log4Net. But in order to get it to compile I had to get it, so I just copied all the libraries to my Program Files folder and compiled. I did not run a installer (don't even know if one exists) but like I said. it works in Win7.</p> <p>I can't get it to work AT ALL in XP. The HResult that i get back is usually 0x80040154. Any clue what is going on? Anything that I should check?</p> <p><strong>EDIT</strong> Showing instantiation of the COM object</p> <pre><code>BOOL hasit = FALSE; try { CString str1; CString str2; str1.Format("%llu", sid); //send as decimal str2.Format("%llX", uid);//send as hex _bstr_t uidStr(str2); _bstr_t sidStr(str1); INetworkPtr obj = NULL; HRESULT hRes = obj.CreateInstance(_uuidof(Network)); hasit = SUCCEEDED(hRes); if (hasit) { CNetwork cti(obj); cti.SendStrings(sidStr, uidStr); cti.ReleaseDispatch(); } else { LogWriter::WriteError(__FUNCTION__, "Error sending Strings", (int)hRes); } } catch(...) { LogWriter::WriteError(__FUNCTION__, "Error sending Strings"); hasit = FALSE; } return hasit; </code></pre>
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    1. PTQuestion
    1. USRobert Snyder
    1. USRobert Snyder
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    1. This table or related slice is empty.
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      1. POCOM object works in Win7 but not XP
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      1. VTModeratorReview
    1. COYou haven't really specified what exactly does not work, but `0x80040154` tells you that the class is not registered. Have you registered it?
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      1. POCOM object works in Win7 but not XP
      1. USZdeslav Vojkovic
    2. CO@ZdeslavVojkovic I've used regasm on it.
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      1. POCOM object works in Win7 but not XP
      1. USRobert Snyder
    3. COhave you specifed `/tlb` and `/codebase` switches?
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      1. POCOM object works in Win7 but not XP
      1. USZdeslav Vojkovic
 

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